According to Charles Darwin's theory of evolution by natural selection, organismsthat possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.

Evolution is the best way of understanding how human world changes.Evolution brings implication of change that comes from within, rather thanbeing directed from without.================================M. Ridley. 2015. The Evolution of Everything: How New Ideas Emerged. New York, NY: HarperCollins Publishers